Chitin is the second most abundant polysaccharide and produced annually as much as cellulose. It is the main structural component of the exoskeletons of animals like insects and crustaceans. Crab, shrimp, squilla and fish scale waste is ideal raw material for chitin production. The extracted chitin ...

Chitin was extracted from three species of crab obtained from biowastes of marine crab (Portunus. pelagicus), brackish water crab (Scylla sp.), and freshwater crab (Gecarcinucidea sp.). The chemical isolation involved 1 M NaOH and 1 M HCl for demineralization and deproteinization, respectively. 50 %...

Chitosan is a cationic polymer obtained by deacetylation of chitin, found abundantly in crustacean, insect, arthropod exoskeletons, and molluscs. The process of obtaining chitin by the chemical extraction method comprises the steps of deproteinization, demineralization, and discoloration. To obtain ...

Chitin, a widely available natural polymer, is the fundamental structural component of crustacean shells. The crustacean processing industry produces a lot of shell waste each year (in millions), most of which is discarded and poses serious environmental problems. This waste can be effectively utili...

Crab shells waste were fermented using six protease-producing Bacillus species (Bacillus subtilis A26, Bacillus mojavensis A21, Bacillus pumilus A1, Bacillus amyloliquefaciens An6, Bacillus licheniformis NH1 and Bacillus cereus BG1) for the production of chitin and fermented-crab supernatants (FCSs)...

A protein/CaCO3/chitin nanofiber complex was prepared from crab shells by a simple mechanical treatment with a high-pressure water-jet (HPWJ) system. The preparation process did not involve chemical treatments, such as removal of protein and calcium carbonate with sodium hydroxide and hydrochloric a...

Crab-shell chitin (SC-20) was evaluated for its ability to enhance biological denitrification in bench-scale tests. In the presence of SC-20, highly reducing conditions were generated, supporting both denitrification and sulfate reduction of aerated water. Rapid degradation of protein in SC-20 was o...

Low molecular weight (LMW) chitin exhibits antimicrobial activity, and its preparation generally employs high molecular weight chitin as raw material. Here we use raw crab shell as material to isolate LMW-chitin. The raw crab shell was treated with hydrochloric acid under different conditions, and t...